WebSVN – gelsvn – Diff – /trunk/apps/MeshEdit/Renderer.h


/*
 *  ManifoldRenderer.h
 *  GEL
 *
 *  Created by J. Andreas Bærentzen on 20/09/08.
 *  Copyright 2008 __MyCompanyName__. All rights reserved.
 *
 */
#ifndef __MESHEDIT_RENDERER_H__
#define __MESHEDIT_RENDERER_H__
 
#include <GL/glew.h>
#include <GLGraphics/draw.h>
#include <GLGraphics/IDBufferWireFrameRenderer.h>
 
/** Ancestral class for Manifold rendering. Do not use directly. Its only purpose is to
	create a display list and remove it when the object is destroyed. This is an example
	of the RAII "resource acquisition is initialization" idiom */
class ManifoldRenderer
	{
	protected:
		GLuint display_list;
	public:
		ManifoldRenderer(): display_list(glGenLists(1))	{}
		virtual ~ManifoldRenderer()
		{
			glDeleteLists(display_list, 1);
		}
		virtual void draw()
		{
			glCallList(display_list);
		}
	};
 
/** Ugly basic gouraud rendering. This class uses OpenGL's fixed function pipeline. */
class NormalRenderer: public ManifoldRenderer
	{
	public:
		NormalRenderer(HMesh::Manifold& m, bool smooth)
		{
			glNewList(display_list,GL_COMPILE);
			GLGraphics::draw(m,smooth);
			glEndList();
		}
	};
 
/** Wireframe rendering. This is a nasty complex class that relies on other classes. The trouble
	is that for non-triangle meshes, we need to use another approach than for triangle meshes.
	This class is really a front end for a couple of other classes. */
class WireframeRenderer: public ManifoldRenderer
	{
		GLGraphics::IDBufferWireframeRenderer* idbuff_renderer;
		
		int maximum_face_valency(HMesh::Manifold& m);
		
	public:
		~WireframeRenderer()
		{
			delete idbuff_renderer;
		}
		
		WireframeRenderer(HMesh::Manifold& m, bool flat);
		
		void draw();
	};
 
/** SimpleShaderRenderer is a very basic class for drawing a Manifold with shading.
	It is a convenient way to draw a surface using vertex and fragment shaders since it takes
	care of initializing the shaders and producing a display list for the geometry. 
 
	Geometry shaders typically add more complexity and are left out of this class, so you cannot add a
	geometry shader.
	
	While this class can be used directly, the normal procedure is to inherit from SimpleShaderRenderer
	and then pass the shaders to the constructor. The strings defining the shaders would fit
	nicely as static constant strings (see e.g. ToonRenderer or GlazedRenderer) in your inherited class.
 
	If you need to define more attributes or uniforms, you need to take charge. Your inherited class's 
	constructor should then use the default constructor of SimpleShaderRenderer. You can call init_shaders
	to initialize the shaders and then compile the display list yourself with the needed uniforms and
	attributes - rather than calling compile_display_list which only puts vertices and normals in the list. 
 */
class SimpleShaderRenderer: public ManifoldRenderer
	{
 
 
 
		/// Compile the vertex and fragment shaders and link to form shader program.
		void init_shaders(const std::string& vss, 
						  const std::string& fss);
		
		/// Produce a display list containing geometry and normals (which may be smooth or per face).
		void compile_display_list(HMesh::Manifold& m, bool smooth);
 
	protected:
 
		GLuint prog,vs,fs;
 
	public:
		
		/// This constructor simply calls init_shaders and then compile_display_list.
		SimpleShaderRenderer(HMesh::Manifold& m, 
							bool smooth, 
							const std::string& vss, 
							const std::string& fss)
		{
			init_shaders(vss,fss);
			compile_display_list(m, smooth);
		}
		
		/** This constructor simply initializes the shaders. It does not create the display list.
			Use if you shader has extra attributes. */
		SimpleShaderRenderer(const std::string& vss, 
							 const std::string& fss) {init_shaders(vss,fss);}
		
		/// Releases the program and shaders.
		~SimpleShaderRenderer()
		{
			glDeleteProgram(prog);
			glDeleteShader(vs);
			glDeleteShader(fs);
		}
		
		/// Do the actual drawing. Simply calls the display list if this function is not overloaded.
		virtual void draw();
	
	};
 
/** Render reflection lines. This class renders the object as if it is specular and inside
	an infinitely long, vertical cylinder with white strips (also vertical). Useful if you
	want to see whether the surface is smooth or has kinks. */
class ReflectionLineRenderer: public SimpleShaderRenderer
	{
		const static std::string vss;
		const static std::string fss;
	public:
		ReflectionLineRenderer(HMesh::Manifold& m, bool smooth):
			SimpleShaderRenderer(m, smooth, vss, fss) {}
		
	};
 
/** Render isophotes with respect to a lightsource in the eye. Useful if you
 want to see whether the surface is smooth or has kinks. */
class IsophoteLineRenderer: public SimpleShaderRenderer
	{
		const static std::string vss;
		const static std::string fss;
	public:
		IsophoteLineRenderer(HMesh::Manifold& m, bool smooth):
		SimpleShaderRenderer(m, smooth, vss, fss) {}
		
	};
 
/** The toon renderer simply quantizes the shading to give a toonish appearance
	with a fat black silhouette. */
 
class ToonRenderer: public SimpleShaderRenderer
	{
		const static std::string vss;
		const static std::string fss;
	public:
		ToonRenderer(HMesh::Manifold& m, bool smooth):
		SimpleShaderRenderer(m, smooth, vss, fss) {}
		
	};
 
/** Render like glazed ceramics. Looks cool. I will add more to this. */
class GlazedRenderer: public SimpleShaderRenderer
	{
		float bsphere_rad;
		const static std::string vss;
		const static std::string fss;
	public:
		GlazedRenderer(HMesh::Manifold& m, bool smooth, float _bsphere_rad=1.0):
		SimpleShaderRenderer(m, smooth, vss, fss), bsphere_rad(_bsphere_rad) {}
		void draw();
	};
 
/** Render a scalar field. Positive scalars are mapped to blue and negative to red.
	This class also has controls for gamma correction which is highly useful if the 
	scalars are mostly small or large and simply scaling to the 0-1 range does not 
	produce a good result. */
class ScalarFieldRenderer: public SimpleShaderRenderer
	{
		const static std::string vss;
		const static std::string fss;
	public:
		ScalarFieldRenderer(HMesh::Manifold& m, bool smooth,
							std::vector<double>& field, double max_val);
	};
 
/** Ambient occlusion renderer. Very similar to ScalarFieldRender. Simply assumes that the input values are
	mean curvatures which in some sense indicate how concave the surface is.*/
class AmbientOcclusionRenderer: public SimpleShaderRenderer
	{
		const static std::string vss;
		const static std::string fss;
	public:
		AmbientOcclusionRenderer(HMesh::Manifold& m, bool smooth,
							std::vector<double>& field, double max_val);
	};
 
/** Patina renderer. Very similar to ScalarFieldRender. Simply assumes that the input values are
 mean curvatures which in some sense indicate how concave the surface is.*/
class CopperRenderer: public SimpleShaderRenderer
	{
		const static std::string vss;
		const static std::string fss;
		float bsphere_rad;
	public:
		CopperRenderer(HMesh::Manifold& m, bool smooth,
								 std::vector<double>& field, double max_val, float _bsphere_rad);
		void draw();
	};
 
 
/** Line fields are rendered by convolving a noise function in the direction of the line.
	This is useful, for instance, for curvature rendering. */
class LineFieldRenderer: public SimpleShaderRenderer
	{
		const static std::string vss;
		const static std::string fss;
		float r;
	public:
		LineFieldRenderer(HMesh::Manifold& m, bool smooth, std::vector<CGLA::Vec3d>& lines, float _r);
		void draw();
	};
 
 
 
#endif
 
Generated by GNU Enscript 1.6.6.
 
 
 

Rev 403	Rev 406
1	`/*`	1	`/*`
2	`* ManifoldRenderer.h`	2	`* ManifoldRenderer.h`
3	`* GEL`	3	`* GEL`
4	`*`	4	`*`
5	`* Created by J. Andreas Bærentzen on 20/09/08.`	5	`* Created by J. Andreas Bærentzen on 20/09/08.`
6	`* Copyright 2008 __MyCompanyName__. All rights reserved.`	6	`* Copyright 2008 __MyCompanyName__. All rights reserved.`
7	`*`	7	`*`
8	`*/`	8	`*/`
9	`#ifndef __MESHEDIT_RENDERER_H__`	9	`#ifndef __MESHEDIT_RENDERER_H__`
10	`#define __MESHEDIT_RENDERER_H__`	10	`#define __MESHEDIT_RENDERER_H__`
11		11
12	`#include <GL/glew.h>`	12	`#include <GL/glew.h>`
13	`#include <GLGraphics/draw.h>`	13	`#include <GLGraphics/draw.h>`
14	`#include <GLGraphics/IDBufferWireFrameRenderer.h>`	14	`#include <GLGraphics/IDBufferWireFrameRenderer.h>`
15		15
16	`/** Ancestral class for Manifold rendering. Do not use directly. Its only purpose is to`	16	`/** Ancestral class for Manifold rendering. Do not use directly. Its only purpose is to`
17	`create a display list and remove it when the object is destroyed. This is an example`	17	`create a display list and remove it when the object is destroyed. This is an example`
18	`of the RAII "resource acquisition is initialization" idiom */`	18	`of the RAII "resource acquisition is initialization" idiom */`
19	`class ManifoldRenderer`	19	`class ManifoldRenderer`
20	`{`	20	`{`
21	`protected:`	21	`protected:`
22	`GLuint display_list;`	22	`GLuint display_list;`
23	`public:`	23	`public:`
24	`ManifoldRenderer(): display_list(glGenLists(1)) {}`	24	`ManifoldRenderer(): display_list(glGenLists(1)) {}`
25	`virtual ~ManifoldRenderer()`	25	`virtual ~ManifoldRenderer()`
26	`{`	26	`{`
27	`glDeleteLists(display_list, 1);`	27	`glDeleteLists(display_list, 1);`
28	`}`	28	`}`
29	`virtual void draw()`	29	`virtual void draw()`
30	`{`	30	`{`
31	`glCallList(display_list);`	31	`glCallList(display_list);`
32	`}`	32	`}`
33	`};`	33	`};`
34		34
35	`/** Ugly basic gouraud rendering. This class uses OpenGL's fixed function pipeline. */`	35	`/** Ugly basic gouraud rendering. This class uses OpenGL's fixed function pipeline. */`
36	`class NormalRenderer: public ManifoldRenderer`	36	`class NormalRenderer: public ManifoldRenderer`
37	`{`	37	`{`
38	`public:`	38	`public:`
39	`NormalRenderer(HMesh::Manifold& m, bool smooth)`	39	`NormalRenderer(HMesh::Manifold& m, bool smooth)`
40	`{`	40	`{`
41	`glNewList(display_list,GL_COMPILE);`	41	`glNewList(display_list,GL_COMPILE);`
42	`GLGraphics::draw(m,smooth);`	42	`GLGraphics::draw(m,smooth);`
43	`glEndList();`	43	`glEndList();`
44	`}`	44	`}`
45	`};`	45	`};`
46		46
47	`/** Wireframe rendering. This is a nasty complex class that relies on other classes. The trouble`	47	`/** Wireframe rendering. This is a nasty complex class that relies on other classes. The trouble`
48	`is that for non-triangle meshes, we need to use another approach than for triangle meshes.`	48	`is that for non-triangle meshes, we need to use another approach than for triangle meshes.`
49	`This class is really a front end for a couple of other classes. */`	49	`This class is really a front end for a couple of other classes. */`
50	`class WireframeRenderer: public ManifoldRenderer`	50	`class WireframeRenderer: public ManifoldRenderer`
51	`{`	51	`{`
52	`GLGraphics::IDBufferWireframeRenderer* idbuff_renderer;`	52	`GLGraphics::IDBufferWireframeRenderer* idbuff_renderer;`
53		53
54	`int maximum_face_valency(HMesh::Manifold& m);`	54	`int maximum_face_valency(HMesh::Manifold& m);`
55		55
56	`public:`	56	`public:`
57	`~WireframeRenderer()`	57	`~WireframeRenderer()`
58	`{`	58	`{`
59	`delete idbuff_renderer;`	59	`delete idbuff_renderer;`
60	`}`	60	`}`
61		61
62	`WireframeRenderer(HMesh::Manifold& m, bool flat);`	62	`WireframeRenderer(HMesh::Manifold& m, bool flat);`
63		63
64	`void draw();`	64	`void draw();`
65	`};`	65	`};`
66		66
67	`/** SimpleShaderRenderer is a very basic class for drawing a Manifold with shading.`	67	`/** SimpleShaderRenderer is a very basic class for drawing a Manifold with shading.`
68	`It is a convenient way to draw a surface using vertex and fragment shaders since it takes`	68	`It is a convenient way to draw a surface using vertex and fragment shaders since it takes`
69	`care of initializing the shaders and producing a display list for the geometry.`	69	`care of initializing the shaders and producing a display list for the geometry.`
70		70
71	`Geometry shaders typically add more complexity and are left out of this class, so you cannot add a`	71	`Geometry shaders typically add more complexity and are left out of this class, so you cannot add a`
72	`geometry shader.`	72	`geometry shader.`
73		73
74	`While this class can be used directly, the normal procedure is to inherit from SimpleShaderRenderer`	74	`While this class can be used directly, the normal procedure is to inherit from SimpleShaderRenderer`
75	`and then pass the shaders to the constructor. The strings defining the shaders would fit`	75	`and then pass the shaders to the constructor. The strings defining the shaders would fit`
76	`nicely as static constant strings (see e.g. ToonRenderer or GlazedRenderer) in your inherited class.`	76	`nicely as static constant strings (see e.g. ToonRenderer or GlazedRenderer) in your inherited class.`
77		77
78	`If you need to define more attributes or uniforms, you need to take charge. Your inherited class's`	78	`If you need to define more attributes or uniforms, you need to take charge. Your inherited class's`
79	`constructor should then use the default constructor of SimpleShaderRenderer. You can call init_shaders`	79	`constructor should then use the default constructor of SimpleShaderRenderer. You can call init_shaders`
80	`to initialize the shaders and then compile the display list yourself with the needed uniforms and`	80	`to initialize the shaders and then compile the display list yourself with the needed uniforms and`
81	`attributes - rather than calling compile_display_list which only puts vertices and normals in the list.`	81	`attributes - rather than calling compile_display_list which only puts vertices and normals in the list.`
82	`*/`	82	`*/`
83	`class SimpleShaderRenderer: public ManifoldRenderer`	83	`class SimpleShaderRenderer: public ManifoldRenderer`
84	`{`	84	`{`
85	`protected:`	-
86	`GLuint prog,vs,fs;`	-
87		-
88	`/// Compile the vertex and fragment shaders and link to form shader program.`	85	`/// Compile the vertex and fragment shaders and link to form shader program.`
89	`void init_shaders(const std::string& vss,`	86	`void init_shaders(const std::string& vss,`
90	`const std::string& fss);`	87	`const std::string& fss);`
91		88
92	`/// Produce a display list containing geometry and normals (which may be smooth or per face).`	89	`/// Produce a display list containing geometry and normals (which may be smooth or per face).`
93	`void compile_display_list(HMesh::Manifold& m, bool smooth);`	90	`void compile_display_list(HMesh::Manifold& m, bool smooth);`
-		91
-		92	`protected:`
-		93
-		94	`GLuint prog,vs,fs;`
-		95
94	`public:`	96	`public:`
95		97
96	`/// This constructor simply calls init_shaders and then compile_display_list.`	98	`/// This constructor simply calls init_shaders and then compile_display_list.`
97	`SimpleShaderRenderer(HMesh::Manifold& m,`	99	`SimpleShaderRenderer(HMesh::Manifold& m,`
98	`bool smooth,`	100	`bool smooth,`
99	`const std::string& vss,`	101	`const std::string& vss,`
100	`const std::string& fss)`	102	`const std::string& fss)`
101	`{`	103	`{`
102	`init_shaders(vss,fss);`	104	`init_shaders(vss,fss);`
103	`compile_display_list(m, smooth);`	105	`compile_display_list(m, smooth);`
104	`}`	106	`}`
105		107
106	`/// This constructor does nothing. Use of you want to control shader program creation or display list generation`	108	`/** This constructor simply initializes the shaders. It does not create the display list.`
-		109	`Use if you shader has extra attributes. */`
107	`SimpleShaderRenderer() {}`	110	`SimpleShaderRenderer(const std::string& vss,`
-		111	`const std::string& fss) {init_shaders(vss,fss);}`
108		112
109	`/// Releases the program and shaders.`	113	`/// Releases the program and shaders.`
110	`~SimpleShaderRenderer()`	114	`~SimpleShaderRenderer()`
111	`{`	115	`{`
112	`glDeleteProgram(prog);`	116	`glDeleteProgram(prog);`
113	`glDeleteShader(vs);`	117	`glDeleteShader(vs);`
114	`glDeleteShader(fs);`	118	`glDeleteShader(fs);`
115	`}`	119	`}`
116		120
117	`/// Do the actual drawing. Simply calls the display list if this function is not overloaded.`	121	`/// Do the actual drawing. Simply calls the display list if this function is not overloaded.`
118	`virtual void draw();`	122	`virtual void draw();`
119		123
120	`};`	124	`};`
121		125
122	`/** Render reflection lines. This class renders the object as if it is specular and inside`	126	`/** Render reflection lines. This class renders the object as if it is specular and inside`
123	`an infinitely long, vertical cylinder with white strips (also vertical). Useful if you`	127	`an infinitely long, vertical cylinder with white strips (also vertical). Useful if you`
124	`want to see whether the surface is smooth or has kinks. */`	128	`want to see whether the surface is smooth or has kinks. */`
125	`class ReflectionLineRenderer: public SimpleShaderRenderer`	129	`class ReflectionLineRenderer: public SimpleShaderRenderer`
126	`{`	130	`{`
127	`const static std::string vss;`	131	`const static std::string vss;`
128	`const static std::string fss;`	132	`const static std::string fss;`
129	`public:`	133	`public:`
130	`ReflectionLineRenderer(HMesh::Manifold& m, bool smooth):`	134	`ReflectionLineRenderer(HMesh::Manifold& m, bool smooth):`
131	`SimpleShaderRenderer(m, smooth, vss, fss) {}`	135	`SimpleShaderRenderer(m, smooth, vss, fss) {}`
132		136
133	`};`	137	`};`
134		138
135	`/** Render isophotes with respect to a lightsource in the eye. Useful if you`	139	`/** Render isophotes with respect to a lightsource in the eye. Useful if you`
136	`want to see whether the surface is smooth or has kinks. */`	140	`want to see whether the surface is smooth or has kinks. */`
137	`class IsophoteLineRenderer: public SimpleShaderRenderer`	141	`class IsophoteLineRenderer: public SimpleShaderRenderer`
138	`{`	142	`{`
139	`const static std::string vss;`	143	`const static std::string vss;`
140	`const static std::string fss;`	144	`const static std::string fss;`
141	`public:`	145	`public:`
142	`IsophoteLineRenderer(HMesh::Manifold& m, bool smooth):`	146	`IsophoteLineRenderer(HMesh::Manifold& m, bool smooth):`
143	`SimpleShaderRenderer(m, smooth, vss, fss) {}`	147	`SimpleShaderRenderer(m, smooth, vss, fss) {}`
144		148
145	`};`	149	`};`
146		150
147	`/** The toon renderer simply quantizes the shading to give a toonish appearance`	151	`/** The toon renderer simply quantizes the shading to give a toonish appearance`
148	`with a fat black silhouette. */`	152	`with a fat black silhouette. */`
149		153
150	`class ToonRenderer: public SimpleShaderRenderer`	154	`class ToonRenderer: public SimpleShaderRenderer`
151	`{`	155	`{`
152	`const static std::string vss;`	156	`const static std::string vss;`
153	`const static std::string fss;`	157	`const static std::string fss;`
154	`public:`	158	`public:`
155	`ToonRenderer(HMesh::Manifold& m, bool smooth):`	159	`ToonRenderer(HMesh::Manifold& m, bool smooth):`
156	`SimpleShaderRenderer(m, smooth, vss, fss) {}`	160	`SimpleShaderRenderer(m, smooth, vss, fss) {}`
157		161
158	`};`	162	`};`
159		163
160	`/** Render like glazed ceramics. Looks cool. I will add more to this. */`	164	`/** Render like glazed ceramics. Looks cool. I will add more to this. */`
161	`class GlazedRenderer: public SimpleShaderRenderer`	165	`class GlazedRenderer: public SimpleShaderRenderer`
162	`{`	166	`{`
163	`float bsphere_rad;`	167	`float bsphere_rad;`
164	`const static std::string vss;`	168	`const static std::string vss;`
165	`const static std::string fss;`	169	`const static std::string fss;`
166	`public:`	170	`public:`
167	`GlazedRenderer(HMesh::Manifold& m, bool smooth, float _bsphere_rad=1.0):`	171	`GlazedRenderer(HMesh::Manifold& m, bool smooth, float _bsphere_rad=1.0):`
168	`SimpleShaderRenderer(m, smooth, vss, fss), bsphere_rad(_bsphere_rad) {}`	172	`SimpleShaderRenderer(m, smooth, vss, fss), bsphere_rad(_bsphere_rad) {}`
169	`void draw();`	173	`void draw();`
170	`};`	174	`};`
171		175
172	`/** Render a scalar field. Positive scalars are mapped to blue and negative to red.`	176	`/** Render a scalar field. Positive scalars are mapped to blue and negative to red.`
173	`This class also has controls for gamma correction which is highly useful if the`	177	`This class also has controls for gamma correction which is highly useful if the`
174	`scalars are mostly small or large and simply scaling to the 0-1 range does not`	178	`scalars are mostly small or large and simply scaling to the 0-1 range does not`
175	`produce a good result. */`	179	`produce a good result. */`
176	`class ScalarFieldRenderer: public SimpleShaderRenderer`	180	`class ScalarFieldRenderer: public SimpleShaderRenderer`
177	`{`	181	`{`
178	`const static std::string vss;`	182	`const static std::string vss;`
179	`const static std::string fss;`	183	`const static std::string fss;`
180	`public:`	184	`public:`
181	`ScalarFieldRenderer(HMesh::Manifold& m, bool smooth,`	185	`ScalarFieldRenderer(HMesh::Manifold& m, bool smooth,`
182	`std::vector<double>& field, double max_val);`	186	`std::vector<double>& field, double max_val);`
183	`};`	187	`};`
184		188
-		189	`/** Ambient occlusion renderer. Very similar to ScalarFieldRender. Simply assumes that the input values are`
-		190	`mean curvatures which in some sense indicate how concave the surface is.*/`
-		191	`class AmbientOcclusionRenderer: public SimpleShaderRenderer`
-		192	`{`
-		193	`const static std::string vss;`
-		194	`const static std::string fss;`
-		195	`public:`
-		196	`AmbientOcclusionRenderer(HMesh::Manifold& m, bool smooth,`
-		197	`std::vector<double>& field, double max_val);`
-		198	`};`
-		199
-		200	`/** Patina renderer. Very similar to ScalarFieldRender. Simply assumes that the input values are`
-		201	`mean curvatures which in some sense indicate how concave the surface is.*/`
-		202	`class CopperRenderer: public SimpleShaderRenderer`
-		203	`{`
-		204	`const static std::string vss;`
-		205	`const static std::string fss;`
-		206	`float bsphere_rad;`
-		207	`public:`
-		208	`CopperRenderer(HMesh::Manifold& m, bool smooth,`
-		209	`std::vector<double>& field, double max_val, float _bsphere_rad);`
-		210	`void draw();`
-		211	`};`
-		212
-		213
185	`/** Line fields are rendered by convolving a noise function in the direction of the line.`	214	`/** Line fields are rendered by convolving a noise function in the direction of the line.`
186	`This is useful, for instance, for curvature rendering. */`	215	`This is useful, for instance, for curvature rendering. */`
187	`class LineFieldRenderer: public SimpleShaderRenderer`	216	`class LineFieldRenderer: public SimpleShaderRenderer`
188	`{`	217	`{`
189	`const static std::string vss;`	218	`const static std::string vss;`
190	`const static std::string fss;`	219	`const static std::string fss;`
191	`float r;`	220	`float r;`
192	`public:`	221	`public:`
193	`LineFieldRenderer(HMesh::Manifold& m, bool smooth, std::vector<CGLA::Vec3d>& lines, float _r);`	222	`LineFieldRenderer(HMesh::Manifold& m, bool smooth, std::vector<CGLA::Vec3d>& lines, float _r);`
194	`void draw();`	223	`void draw();`
195	`};`	224	`};`
196		225
197		226
198		227
199	`#endif`	228	`#endif`
200		229
201	`Generated by GNU Enscript 1.6.6.`	230	`Generated by GNU Enscript 1.6.6.`
202		231
203		232
204		233

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